<!DOCTYPE html>
<html lang="en">
<head>
    <meta charset="UTF-8">
    <title>Title</title>
</head>
<style>
    .banner{
        width: 1200px;
        height: 700px;

    }
    .box1,.box2,.box3,.box4{
        width: 200px;
        height: 680px;
        float: left;
        margin-right: 20px;
        margin-top: 10px;
    }
    .box1{
        background-color: rebeccapurple;
    }
    .box4{
        background-color: red;
    }
    .box2{
        background-color: pink;
    }
    .box3{
        background-color: darkred;
    }
</style>
<body>

<div class="banner">
    <div class="box1"></div>
    <div class="box2"></div>
    <div class="box3"></div>
    <div class="box4"></div>
</div>
</body>
</html>